永久变形

金属防护挡片永久变形；

Permanent distortion of a metal barrier ;

根据实测的永久变形与温度循环次数的关系，提出了一个幂函数的数学模型。

On the basis of relationship between permanent distortion and thermal cycling number , we present mathematical model in terms of power function .

PU的氢键并不提供其高强度和模量，但可使永久变形，力学滞后和应力软化有所下降。

The Permanent deformation , mechanical hysteresis and stress softening of PU were also reduced .

随着热塑性弹性体中EVA用量增大，弹性体的拉伸强度、赵氏硬度和拉伸永久变形增大。

The tensile strength , hardness and permanent deformation of the elastomer increased with the increase of EVA content .

研究了二段硫化对均聚型（CO）/共聚型（ECO）氯醚共混胶的力学性能以及高温压缩永久变形的影响。

The effect of post vulcanization on mechanical properties and permanent set at high temperature of CO / ECO blends was investigated .

结果表明，用过氧化物交联后，POE的拉伸强度、扯断伸长率和扯断永久变形大幅度下降。

The results showed that the tensile strength , elongation at break and permanent set at break of POE decreased greatly after crosslinking .

实验结果表明，加入的纳米填料和PU材料有很好的相容性，可以均匀地分布在PU材料之中，使PU泡沫的压缩永久变形大幅度下降。

Finally , the polyurethane foam was reinforced by nano SiO_2.The result showed that the permanent deformation of soft polyurethane foam could be decreased very much because of adding nano filler .

利用广义Burgers模型分析得出了材料的粘性变形参数&粘性变形柔量G，并结合壳牌的车辙预估方法提出了沥青稳定基层永久变形的预估方法。

Viscous parameter G can be got by making use of generalized Burgers model . Based on rut prediction of shell a new method to forecast the unrecovered deformation is put forward .

采用沥青路面分析仪（APA）研究水作用下混合料试件永久变形的表现形式。

The objective of this study was to investigate the effects of water on permanent deformation potential using asphalt pavement analyzer ( APA ) .

研究促进剂TMTD用量对均聚型氯醚橡胶（CO）/共聚型氯醚橡胶（ECO）并用胶硫化特性、物理性能、耐热老化性能和高温压缩永久变形的影响。

The effect of TMTD on the curing behaviour , physical properties , heat aging property and permanent set at high temperature of CO / ECO was investigated .

应用于软聚氯乙烯（PVCS）时，断裂强度、断裂伸长率均得到提高，而永久变形量明显降低，并且交联时间的延长对力学性能影响显著。

When the crosslinkers were applied to PVC-S , tensile strength and elongation at break increased , simultaneously , and the deformation set decreased . The time of crosslinking possessed an effect on the mechanical properties .

随着硫化助剂用量增加，TAIC共混胶的拉伸强度、拉断伸长率和撕裂强度均大于PDM共混胶，而压缩永久变形的变化率正好相反。

The tensile strength , elongation at break and tear strength of TAIC were higher than those of PDM while the compression set was opposited .

在合适的二次硫化条件（160℃×2h）下，添加适量的促进剂TMTD，可以减小并用胶的高温压缩永久变形。

And the permanent set at high temperature of vulcanizate after proper post-cure ( 160 ℃× 2 h ) improved by adding TMTD .

结果表明：随弹性体用量增大，软质PVC材料的拉伸强度、撕裂强度下降，断裂伸长率、加热损失率及压缩永久变形3种性能得到改善。

The test results showed that with the increase of elastomer dosage , the elongation at break , the heat losing ratio and the compression set were improved , but the tensile strength and tear strength were decreased .

研究结果表明：加入PP时，材料的拉伸强度、熔体流动速率和压缩永久变形增大，但其断裂伸长率迅速下降，回弹性逐渐降低；

The results showed that in case of adding PP , the tensile strength , melt flow rate and compression set of the SEBS increase , but the elongation at break decreases quickly and the elastic resilience decreases gradually ;

在这一发现的基础上，引入Newmark地震永久变形的思想，并将其运用于圆形滑动面从而提高了该方法的精度并减少了试算的繁复性。

The idea of Newmark method is induced to calculate permanent deformation on circular sliding surfaces . The precision is increased and the complexity of searching is lessened .

在EVA中混入EPDM可使发泡材料的拉伸强度、撕裂强度和粘合强度提高，而收缩率和压缩永久变形降低；

It was found that the tensile strength , tear strength and adhesion strength of the foam increased , and the shrinkage and compression set of the foam decreased by blending EVA with EPDM or IIR ;

结果表明，加入1.5～5.0份MAA－Zn，可提高硫化胶的100%定伸应力、硬度和抗压缩永久变形能力，但对其他力学性能影响甚微。

The results showed that the modulus at 100 % , Shore hardness and resistance to compression permanent set increased by adding 1.5 ~ 5.0 phr of MAA-Zn without harm to the other properties of vulcanizate .

结果表明金属活性助剂MCA，在不同的硫化体系中可提高丁腈橡胶的拉伸强度、硬度，改善丁腈橡胶的耐热老化性能及压缩永久变形性能。

The results have shown that MCA can increase tensile strength and hardness of NBR and also improve the properties of resistance to heat aging and compression set of NBR as well .

结果表明，二甲基硅油可降低MVQ硫化胶的模量，但硫化胶扯断永久变形和压缩永久变形较大；

The results showed that the modulus of MVQ vulcanizate decreased with dimethyl silicone oil while the tensile set and compression set increased ;

研究了不同并用比的氟橡胶（FKM）和丙烯酸酯橡胶（ACM）并用胶的硫变特性、物理机械性能、耐老化性、热稳定性和压缩永久变形性能。

The cure characteristics , mechanical properties , resistance to heat and aging and compression set properties of ACM , FKM and their blends of varying compositions were studied .

探讨了发泡剂、交联剂、促进剂以及LLDPE与低密度聚乙烯（LDPE）的配比对高发泡塑料的表观密度、回弹率、压缩永久变形和压缩强度的影响。

The influence of foaming agent , accelerating agent , and the ratio of LLDPE / LDPE on the apparent density , the ratio of bounce , the compression deformation and the strength of foam were studied in detail .

确定了2618AT851厚板的最佳生产工艺参数，即固溶温度530℃，预拉伸永久变形量：1.5%～3%，人工时效温度190℃，时效时间20h。

They are solution temperature , 530 t , pre & drawing set deformation volume , 1.5 % - 3 % , artifical aging , 190 ℃ / 20 h.

通过沥青路面分析仪（APA）车辙试验，探讨精细级配沥青混合料的抗永久变形能力，并从沥青混合料体积结构与沥青膜厚度的角度对试验结果进行分析。

Through asphalt road analysis ( APA ) rutting-test , the resistance to permanent deformation of coarse and fine-graded asphalt mixtures are probed . The analysis of volumetric structure of mixtures and the film thickness are conducted .

研究表明：随硫化温度增大，填料间相互作用、交联密度减小，T10和T90明显缩短，压缩永久变形增大。

The experimental results show that the interaction between filler and crosslinking density decreased with the curing temperature increased , but the cure rate and compression set increased .

结果表明，DTDM有效硫化体系硫化胶的压缩永久变形最小；

The results showed that DTDM EV system was the most effective in terms of the minimum compression set of the vulcanizate ;

结果表明，在MgO/PER/TRA硫化体系中，PDM是有效的防焦剂，采用PDM/防老剂AW硫化体系可以制得压缩永久变形和耐热性能优良的硫化胶。

The results showed that PDM was an effective scorch retarder for MgO / PER / TRA vulcanizing systems , and the vulcanizates with excellent compression permanent set and heat resistance could be obtained by PDM / antioxidant AW vulcanizing systems .

在胎体胶配方中以1份促进剂TBSI替代125份促进剂DZ，胶料的焦烧时间延长，t90缩短，硫化胶的拉断永久变形减小，H抽出力相当。

And the scorch time extended , t_ ( 90 ) reduced , the permanent tensile set decreased and the H pull-out changed little using 1 phr of TBSI instead of 1.25 phr of DCBS in the carcass compound .

研究了不同硫化体系和不同无机填料对丁腈橡胶N41在100℃高温下的压缩永久变形的影响。

The influence of different curing systems and inorganic fillers on the compression set of NBR N41 at100 ℃ was studied .

机组168h试运转后，未发现膨胀不畅而产生水冷壁结构永久变形，总体安装质量全部达到设计要求。

After trial operation for 168 h no permanent deformation of the wall structure caused by uneven expansion was found and the installation quality has met the design requirements .